Exhaust fan



H. R. CLARAGE EXHAUST FAN Filed April 5. 1924 IN VENTOR Harry R. Ola/$222 KW/ A TTORNE Y6.

Patented Oct. 6, 19 25.

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: Application filed April 3, 1924. Serial No. 703,953.

To all whom it may concern:

Be it'known that I, HARRY R. CLARAG a citizen of the United States, residing at the city and county of Kalamazoo, State 'of Michigan, haveinvented certain new and useful Improvements in Exhaust F a1is, of which the follow'ingi's'a specification.

This invention relates to improvements in exhaust fans;-- I r The main objects of this invention area- 3 First, to provide an improved exhaust fan which is of large. capacity and of high efficiency relative to its size.

Second, to provide an improved exhaust fan which is not likely to become clogged or broken by the passage of sticks or the like therethrough, for instance, where the fan is employed as an exhaust or suction means for wood working machines and the like.

Third, to provide an improved exhaust fan having these advantages which is reversible, that is, the motor and inlet may be reversed as may be desired, and also the direction of discharge, without in any wise impairing the efficiency or adaptability of the fan.

Further objects, and objects relating to structural details, will definitely appear from the detailed description to follow.

I accomplish the objects of my invention by the devices and means described in the following specification. The invention. is clearly defined and pointed out in the claims.

A structure which is a preferred embodiment of my invention is clearly illustrated in the accompanying drawing, forming. a part of this application, in which:

Fig. I is a side elevation of my improved fan, the discharge pipe being partially broken away.

Fig. II is an enlarged detail vertical section on a line corresponding to line 2-2 of Fig. I.

Fig. III is an enlarged detail section on a line corresponding to line 33 of Fig. II showing details of the fan. a 1

Fig. IV is a detail section on aline corresponding to line H of Figs. II and III, showing further details of the fan.

In the drawing similar reference characters refer to similar parts throughout the several views, and the sectional views are taken looking in the direction of the little arrows at the ends of the section lines.

Referring to the drawing, 1 represents the motor and 2 the driving or fan shaft.

1 I provide a housing comprising a main annular body member 3 havinga discharge 4 to which the discharge conduit 5 is connected. This body member has opposed side openings 6, the openings being of the same I size. One of'th'ese side openings'is closed-by the side wall 7 L and the other by the inlet member 8. The side wall 7 has a central open1nge9 therein' for the shaft 2. These trated, integral pedestals 10.

The inletmember 8 has an inwardly ex side members have, in the structure-inns I ing the velocity and transforming a part of the velocity head to suction or static head This increases the effective wheel inlet diameter over that of the inlet conduit 12.

The wheel comprises a hub 13 having radially disposed arms 14 on which are mounted blades 15. These blades are ovately shaped, disposed with their smaller ends inwardly, their outer edges 16 being straight.

The outer ends of the blades are forwardly curved and the blades are provided with forwardly curved flanges 17 on their side edges, the flanges 17 merging into the edges of the blade at the outer ends thereof and at points adjacent the inner ends thereofsee Figs. III and IV.

By thus forming the blades their capacity is increased and further they are strengthened so that backing plates are not required. The fan thus constructed is uniform, that is, no backing plates are required and it may be used either as a right or left-hand fan merely by changing the inlets, and the discharge may be located where desired.

My improved fan is of very high efliciency and, as stated, the discharge may be adjusted as desired and the fan may be driven comprising a main body member having atangential discharge and opposed side openings, a side wall, an inlet member having an inwardly expanding inlet of Venturi-like curvature, said side walland inlet members being interchangeably mounted in said side openings, a shaft disposed through said side wall, a fan wheel comprising a hub having arms, and ovately-shaped blades mounted on said arms with their smaller ends disposed inwardly, their outer ends being forwardly curved, their side edges having forwardly curved flanges, the ends of which merge into the ends of said blades both at the outer forwardly curved ends thereof and at points adjacent their inner ends.

2. In a fan, the combination of a housing provided with an inwardly expanding side inlet of Venturi-like curvature, a fan Wheel comprising arms-,and ovately-shaped blades mounted on said arms with their smaller ends, disposed inwardly, their outer ends be ing forwardly curved, their side edges having forwardly curved flanges, the ends of which merge into the ends of said blades both at the outer forwardly curved ends thereof and at points adjacent their inner ends.

3. In a fan, the combination of a. housing, a fan wheel comprising arms, and o-vatelyshaped blades mountedon said. arms with their smaller ends disposed inwardly, their outer ends being forwardly curved, their side edges having forwardly curved flanges, the ends of which merge into the ends of said blades both at the outer forwardly curved ends thereof and atpoints adjacent their inner ends.

In Witness whereof I have hereunto set my hand.

HARRY R. CLARAGE; 

